Airplane spray unit



Mafch 5,1946( NQJHUSMAN AL 2,395,321

AIRPLANE SPRAY UNIT Filed July 3; 1945 .C4 NMUSMAN underneath the airplane in relation Patented Mar. 5,1946 v AIRPLANE SPRAY UNIT` y and oun M. Longwy,

chester N.-v Husman Orlando, Fla.,

'assis-nots to the United States of America as represented by the Secretary of Agriculture and his successors oflce Application July 3, 1945, serial'No. 603,102

1 claim. (11244-136) v (Granted under the act' of March s, 1883, las amended April .3 0, 1928; 370 O G. 757) This application is made under the act of March 3, 1883, as amended by the act of April 30,1928, and the inventionV herein described'li'.

' patented, may be manufactured andused by or for .the Government .of the United States of America for governmental purposes without the payment to us of any royalty thereon.

This invention relates to equipment for the distribution of insecticides and other spray mate-y rials from aircraft, and has among its objects theprovision of4 equipment of Vthis type which is readily mountable and removable and which will direct the flow of spray material even and uniform manner. J 1 A preferred embodiment of the Yinvention is illustrated in the -accompanying drawing in` which:

Figure 1 is a side view of an airplane equipped with a. spray unit ofthe type described, and

Figure 2 is a View in 'prospective showing thev spray nozzlesin greater =v venturi assembly and detail. Y

As illustrated, the spray unit comprises a tank l whichis mounted within the fuselage. In an aircraft of the type indicated in the drawing, the tank I is conveniently mounted by attaching downward in an spray on the aircraft. The equipment has been Y approved bythe Civil Aeronautics Administrait to the Vrear seatbrackets and Atop rear seat,`

cross member with bolts or clamps. Similar means may be used in other types of aircraft. 'I'he tank l is equipped witha float gauge l2, suitable cover plates (not shown) to allow the tank tobe illled, and an outletsirable to arrange a baffle plate (not shown) lon- Eitudinally within the tank to keep the spray .material from sloshing from side-to 'side while in' material is drawn from the tank by agear pump thewing struts and is f driven by a propeller 5.y The' pump loper-ates-y at a pressure-,of about '70 pounds ilight, and to add structural strength,

l which is clamped to.

rial is delivered byfthis means to nozzles 8y located 1. The venturi 1 is supported on brackets which are ybolted to ilttings arranged on the longrons. This meditato: mounting vallows the 'venturi 1 Spray mate-y to a-yenturi l to be spaced away from the Iuselageso that'a free airvelocityis created above the venturi whichk results in ,better distribution of the spray material. 4The bottom 'of the venturi 'iis ilared downward toward its'trailing edge, and thespray 'Y i nozzles 6 are Amounted .just beyond this edge. The nozzlesv are preferably of the convex baille sprayV type with a very fine-orice. A" quickaction shut-oil valve 8 is arrangedin the venturi 1 to control the flow of spraymaterial to the l,

nozzles B, and this valve] is operated by a control cable 9 which runs to the instrument panel;

of thefaircraft.

Spray equipment ofv this ytype has. beenl i'ouncll .to give veryfsatisfactory results. .It can be in''V stalled without structural change in aircraft with whichit is used, and it `can be'mounted or removed in a relatively short periodo! time. The

Venturi construction, together with themanner in which the venturiis spaced from the fuselage ftoprovide an overheadjfree air velocity, directs the sprayk flow downward in .a uniform and even swath,and"obviates troublesome collection of the tionV and isllicensed for N. :C. aircraft.

. Having' thus described our invention, kwe claim: I An; airplane spray unit y tirtheftvpe described' comprising, in combination withvan airplane, a

liquid container positioned-within the fuselage -of said airplane,- a'fventuri ared downward at its trailing edge'arranged underneath and Vin `'spaced relation vto the lfuselageof said airplane,'-a plurality of sprayozzles provided at the lower trailing edge of said venturi,v liquid conduit means connecting said sprayznozzles with said liquid container,v airdriven pumping means mounted l' externally on said airplane in cooperation with i said liquid conduit means, whereby liquid in said Y liquid container can be delivered to saldi spray nozzles, and means lfor controlling liquid ilow through said liquidconduitfmeans.

. CHESTER N,`HUSMAN.

our: M. innesco?. 

